Chapter 11 (Animal development and diversity)

Question 1

Define: Cleavage

Answer 1

The splitting of cell in mitosis to form a multi-cellular hollow ball called the Blastula.

Question 2

Define: Gastrulation.

Answer 2

Part of the embryo folds inward. This will form the embryonic tissues such as the ectoderm and the endoderm.

Question 3

Define: Larva

Answer 3

A sexually immature stage which is usually morphologicaly different from the adult. The larva usually eats different food to the adult and lives in a different habitat.

Question 4

Define:Metamorphosis

Answer 4

The process in which an animal larva is transformed into the adult.

Question 5

Define: Grade

Answer 5

A group of animal species that share the same level of organisational complexity.

Question 6

How many plains in a radially symmetrical animal?

Answer 6

Many

Question 7

How many plains in a bilateral symmetrical animal?

Answer 7

One

Question 8

Define: Dorsal and ventral

Answer 8

Dorsal= Top side Ventral= Bottom side

Question 9

Define: Anterior and posterior

Answer 9

Anterior= Head end Posterior= Tail end

Question 10

Define: Cephilization

Answer 10

The evolutionary trend associated with bilateral animals in which the sensory equipment is on the anterior end. also include having the central nervous system in the head then extending down towards the posterior end as a nerve cord.

Question 11

Name three germ layers.

Answer 11

Ectoderm
Endoderm
Mesoderm

Question 12

What is an animal with only two germ layers called?

Answer 12

Diploblastic